Title:	The repetitive DNA landscape in the brizantha agamic complex of Urochloa P. Beauv.
Authors:	CORREA, C. T. R. VAIO, M. BARRIOS, S. C. L. VALLE, C. B. do TORRES, G. A. TECHIO, V. H.
Affiliation:	CAIO T. RODRIGUES CORREA, UNIVERSIDADE FEDERAL DE LAVRAS; MAGDALENA VAIO, UNIVERSIDAD DE LA REPÚBLICA; SANZIO CARVALHO LIMA BARRIOS, CNPGC; CACILDA BORGES DO VALLE, CNPGC; GIOVANA A. TORRES, UNIVERSIDADE FEDERAL DE LAVRAS; VÂNIA H. TECHIO, UNIVERSIDADE FEDERAL DE LAVRAS.
Date Issued:	2025
Citation:	Genome, v. 68, p. 1–13, 2025.
Description:	ABSTRACT - Urochloa P. Beauv. (formerly classified as Brachiaria (Trin.) Griseb.) is a genus of African perennial grasses that is extensively cultivated in tropical countries for cattle nutrition. Three of the most economically relevant species, Urochloa brizantha, Urochloa decumbens, and Urochloa ruziziensis, form the brizantha agamic complex, which includes allopolyploid series with distinct subgenomes. Investigating the composition and organization of repetitive DNA, a major component of grass genomes, can provide insights into their genomic relationships and evolutionary history. This study aimed to characterize the repetitive DNA landscape of selected Urochloa species belonging to the brizantha agamic complex; identify and compare major repeat classes across species; and evaluate their potential as cytogenetic markers on mitotic chromosomes using fluorescent in situ hybridization (FISH). Clustering analysis revealed that repetitive DNA constitutes 56%–65% of the genomes, with Ty3/Gypsy retrotransposons, particularly the Athila and Retand lineages, representing the most abundant repeat class. Urochloa decumbens exhibited the highest proportion of Ty3/Gypsy retrotransposons, while U. ruziziensis had the highest satellite DNA content. The chromosomal location of representative satellites (UroSat-1a, UroSat-2a, and UroSat-3) was determined in all three species via FISH. UroSat-1a was detected in all centromeres, while UroSat-2a and UroSat-3 signals varied in number and position. Our findings validate the use of satDNA as cytogenetic markers in the brizantha agamic complex of Urochloa and revealed genomic relationships among different species and ploidy levels.
Thesagro:	Brachiaria
NAL Thesaurus:	Cytogenetics In situ hybridization Retrotransposons Polyploidy Satellite DNA Urochloa brizantha Urochloa ruziziensis
ISSN:	1480-3321
DOI:	https://doi.org/10.1139/gen-2024-0096
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPGC)